Water Sensitivity of Asphalt Paving Mixturesby R. L. Terrel, Oregon State Univ, United States,
S. Al-Swailmi, Oregon State Univ, United States,
Document Type: Proceeding Paper
Part of: Serviceability and Durability of Construction Materials
There are two mechanisms by which moisture can degrade the integrity of an asphalt concrete matrix: (a) loss of cohesive strength and stiffness in the asphalt film and (b) the failure of the adhesive bond between the aggregate and asphalt. A working hypothesis of the water sensitivity research effort is that the void structure designed into conventional asphalt mixtures may be a major cause of water damage. Low void mixtures are virtually impermeable and preclude entrance of water. High void or open-graded mixtures are free draining and do not retain water. Between these limits, termed 'pessimum' voids, is where most pavements are constructed and is also the range where water damage is most obvious.
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